The human heart is a powerful muscular organ that plays a central role in the circulatory system. Its primary function is to pump oxygenated blood to the body and Deoxygenated blood to the lungs. Despite its relatively small size, about the size of a clenched fist, the heart works tirelessly, beating about 1,00,000 times a day to ensure that blood circulates effectively throughout the body. Understanding how the heart pumps blood involves exploring its structure, the sequence of its contractions, the valves that control blood flow, and the electrical signals that regulate its rhythm. Anatomy of the Heart The heart is located in the chest cavity, slightly to the left of the sternum. It is enclosed by a protective sac called the pericardium and is made up of three layers: Epicardium (outer layer) Myocardium (muscle layer) Endocardium (inner lining) These heart is divided into four chambers: 1. Right Atrium 2. Right Ventricle 3. Left Atrium 4. Left Ventricle These chambers work together t...